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Consider the following student relation.
Student relation has Name, Subject1_Marks, and Subject2_Marks attributes.
What is the output for the given SQL query?
Query:
Select sum(subject1_Marks)+sum(Subject2_Marks)
From student;
  • a)
    135
  • b)
    50
  • c)
    null
  • d)
    Error
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider the following student relation.Student relation has Name, Sub...
The correct answer is option A.
Concept:
Sum():

It takes one set of values and gives one output. The SUM() function returns the total sum of a numeric column.
SUM() Syntax:
SELECT SUM(column_name)
FROM table_name
WHERE condition;
Explanation:
The given table is,
Consider the following student relation.
Student relation has Name, Subject1, and Subject2 attributes.
Query:
Select sum(subject1_Marks)+sum(Subject2_Marks)
From student;
Here calculates the sum of subject1 marks and subject2 individually. And finds the total sum of two subjects.
Note:
Here Sum() function ignores the null values whichever addition or subtraction or multiplication is required.
Subject1_Marks calculates the 10+20+30=60.
Subject2_marks calculates the 5+10+15+20+25=75
sum(subject1_Marks)+sum(Subject2_Marks)= 60+75= 135
Hence the correct answer is 135.
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Consider the following student relation.Student relation has Name, Subject1_Marks, and Subject2_Marks attributes.What is the output for the given SQL query?Query:Select sum(subject1_Marks)+sum(Subject2_Marks)From student;a)135b)50c)nulld)ErrorCorrect answer is option 'A'. Can you explain this answer?
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